E362 weekly meeting 
At KEK R306, June 12 (Tues), 17:00-18:00
Present:Ishii,Chikamatsu,Sakai(INS),Nakamura,Sakuda,Ohyama,
     Ishida(KEK),Etou(Tokai),Maruyama(Tohoku),Kohama(Kobe),Nakamura(Niigata)

(1)Maruyama calculates the muon rate and its profile after 2m and 3.5m of 
iron at the beam bump. The profile of muons is about sigma_x=62cm. 
He and Nishikawa are designing gas Cherenkov counters after the horn to
count the numbers of pi/K. 

(2) Sakai negociates with the company about the price of VME board computer. 

(3) SCIFI test: Etou estimates the trigger rate of accidental coincidence using 
two scintillation counters. The present 10% accidental rate can be reduced 
to a few % level. He will also check the one photo-electron pulseheight for 
the PMT. 

(4) Chikamatsu quoted Fujita's comparison of the following four Monte Carlo 
simulations with E261A data (pi's incident on water):(1) old Kamioka version,
(2) Gheisha, (3) Fluka and (4) GCALOR. Fujita's study shows that (1) and (4) 
reproduce the data well while (2) and (3) overestimate the nuclear 
interactions.   Chikamatsu points out that Ohyama should use (1) or (4) 
instead of (2) or (3) for his study on the nu_mu+p/nu_mu+n NC interactions. 

(5) Nakamura (KEK) questions if the cross-section of the decay tunnel 
can be made square, not round and if anyone can figure out a clever method 
to fill the decay volume with helium. 

(6) Nakamura (Niigata) studies the acceptance of nu_e+n->e+p events for 
various realistic geometries using 600 to 1620 blocks of lead-glass counters. 
He finds that the acceptance for the case of 1620 blocks is only a few % larger 
than that for 600 blocks. He also finds that the energy loss 
of electrons in water due to shower is significant (1X0=36cm) and that 
only the half of the volume close to the LG can be used for the measurement 
of electron energy. He will further check the S/N.

(7) Kohama designs the endplate of the second horn.

(8) Ishii reports the status of muon electronics: Tauchi tests the TDC modules 
and Shiino designs the electronics system of the tension measurement.

(9) Other hardware:
>150 modules of muon chambers and >100tons of iron filters were removed 
from VENUS detector (June 10-15). A new drum was delivered to KEK on June 13. 
It will be transferred to Nagoya next week. Nakamura (Nagoya) will plans the
schedule for the fabrication of fiber sheets.
// (Memo by Sakuda)